Tapping machine



Feb. 3, 1925. 1,525,134

H. HUBBELL TAPPING MACHINE Filed Nov. 8', 1922 l4 Sheets-Shet 1 m IN V EN TOR.

A TToRNEys.

' f6 "l j? ZI f2! wy W BY a I Feb, 3, 1925.

H. HUBBELL TAPPING MACHINE 4 Sheets-Sheet 2 Filed Nov. 8, 1922 A T TORNE YS.

Feb. 3, 1925.

1.525.134 H. HuBBl-:LL

TAPPING momma Filed Nov. e, 1922 4 sheets-sheet :s

/0 l 4f .f IN I N 1 DE.

III

E Y TORNEYS.

Feb.3,1925. 7 1,525,134'

H. HUBBELL e TAPPING MACHINE Filed Nov. 8, 1922 4 Sheets-Sheet 4 f. ffl IN V EN TOR.

794W? BY l v TTEYS.

Patented Feb.. 3, 1925..

nire stares HARVEY' HUBBELL, or nnrnonro'nr, conn'nofricu'r.

TAPPING Application filed November To all whom t may concern:

Be it known that I, HARVEY HUBBELL,

a citizen of the United States, residing at Bridgeport, county of Fairfield, State of s Connecticut, have invented an improvement in Tapping Machines, of which the following is a specification.

This invention relates to a machine drive and the means for controlling the same, 10 and has for an object to provide an improved and simple drive for a machine which will be reliable in operation, which will be easy to operate and which will not be liable to be easily gotten out of order.

It is a further object of the invention to provide an improved electrical drive for a machine and a controlling means therefor in which the electrical power is automatically shut oif when the operator leaves the machine, to thus prevent waste of power and also wear on kthe machine when it is not being used.

VVit-h the foregoing and other objects in view l have devised the construction illustrated in the accompanying drawings, in which y Fig. 1 is a side elevation of a tapping machine showing my invention applied thereto.

Fig. 2 is a rear elevation of they machine shown in Fig. 1.

Fig. 3 is a top plan view thereof.

Fig. 4 is a transverse section substantially on line 4-4 of'Fig. 3, the motor, however, being shown in elevation.

Fig. 5 is a longitudinal section through the work holding slide showing its relation to the tap.

Fig. 6 is an end elevation thereof looking from the left of Fig. 5.

Fig. 7 is a detail of a portion of the automatic release, and

Fig. 8 is a detail section of the thrust bearing for the shaft.

The machine illustrated comprises a top or frame 10 supported upon a pedestal 11 having a base 12 resting upon the floor. The top is preferably substantially rectangular, as shown in Fig. 3, with an upstanding flange 13 extending about the edge thereof. Mounted upon this top is a supporting member 14 having upstanding arms provided with bearings 16 for a shaft 1'? carrying a. tool, which in the present instance, is tap' 18, removably secured to the shaft MACHINE.

, 1922. Serial No. 539,654.

by a clutch 19 in the usual manner. Vrlhe bearing at the other end of this shaft is a ball thrust bearing adapted to take the thrust of the shaft incident tothe operation of the machine and is preferably substan` tially that shown in Fig. 8. lt comprises a housing 2O carried by the armA 15, this iousing. beingprovided with a. chamber 21 in which arev mounted rings 22 provided with raceways for the balls 23.*V The open side of the housing is closed by a ring 24 securedthereto by screws 25, and is 'provided with a groove 26 to carry a suitable oaclring to retain theoil in thehousing. ecured to the shaftby any suitable means as a nut 27 is a sleeve 28 provided with raceways for the walls. Mounted yon a shaft between the arm 15 carrying the thrust bearing and the next bearing are two cone pulleys 29 and 30. These pulleys may be secured to the shaft by any means desired, but l have shown them as formed integral with the sleeve 31 embracing the shaftand secured thereto by the pins $32. The pulleys are arranged with their inclined surfaces facing each other, as shown in Fig. 3. Adapted to coact with these pulleys to drive the shaft in opposite directions and., therefore, located between the saine, is a' cone driving pulley 33, mounted on the shaft 34 of the rotor of an electric motor 35. This motor is mounted on a support 3b pivotally mounted in an. opening 37 in thc top or frame 10. The pivotal inounting'for this support is shown more clearlyin Fig. 4 and comprises a rod 33'mounted in bearings 39 and 40 in the top or frame on opposite sides of the opening 37 with suitable oiling openings 41 leading thereto. Forming a thrust bearing for kthe outer endI of this rod is a screw 42 which may be adjusted longitudinally of the anis of the rod to adjust the position of the motor and properly locate tne pulley 33 with respect to the pulleys 29 and 30, and it may be secured in adjusted position by the set screw 43. Secured to the under side of the frame, by any suitable means as a screw 44, is a bracket 45 extending partly across the opening 3'? and extending upwardl,v shown at 46 to provide a bearing for 'the rod Between this upwardly extending portion and the support 36 tor the motor is a coll spring 47 embracing `the rod 33 and as the support 36 is secured to the rod by llO any suitable means such as a pin 48 this spring will hold the outer end of the rod against the inner end of the screw 42. The screw 42 will also take the thrust on the motor shaft from the pulleys 29 and 30.

rlhe pulleys are preferably covered by a suitable guard such as that shown at 49 in Figs. 1 and 4. rlChis guard is curved over the pulleys as shown and is hinged adjacent its lower end as shown at 50 to a supporting bracket 51 secured to upright arms 15 by suitable screws 52. rlhe guard may be swung outwardly and downwardly to expose the pulleys for examination and repairs.

The motor support 3G is provided with a downwardly extending arm 53 for rocking this support and with it the motor to bring the pulley 33 alternately into engagement with pulleys 29 and 30 to rotate the shaft 1.7 in the direction desired. Fulcrumed at 54 on the lower part of the pedestal 11 is a pedal carrier 55 and pivoted to this carrier adjacent the forward edge thereof, as shown at 56, is a pedal. 57 connected to the arm 53 by a connecting rod 58, this rod having pivotal connection to the pedal, as shown at 59. The pedal carrier is preferably substantially U-shaped with the legs extending on opposite sides of the pedestal and pivoted thereto, while the connecting portion 60 between these legs is preferably located at the rear of the pedestal. Mounted on this connecting portion is a weight ($1, and this portion is connected by a connecting rod to an electric switch G2 mounted on the under side of the top or frame 10. This connecting rod is preferably made in two sections 63 and 64 connected respectively to the pedal carrier and the switch, and they have sliding engagement with each otheras by means of a lateral offset 65 carried by the section 64 through which the section 63 extends and may slide. Secured to the upper section 64 and having sliding engagement with the section 63 is a collar 66 while adjacent the. offset 65 a collar 67 is secured to the section 63 and a coil spring 68 embraces this section between these two collars. It will thus be apparent that this arrangement provides a yielding connection between the pedal carrier and the switch, the switch being closed through the spring (S8 but being opened by a positive action of the collar 67 on the offset 65. The switch is an ordinary knife blade switch, and is opened by pulling the free end thereof downwardly, the pi vot therefor being shown at 69.

The connecting rod 58 from the pedal to the arm 53 is also made in two sections 7() and 7l. The upper section is provided with laterally extending lugs 72 and 73 with which the lower section has sliding engagement. Below the lug 73 collar 74 is secured to the section 70 and below the lug 72 a second collar 75 is secured to this section. A coil spring 7 6 embraces the section 7 O between the lug 73 and the collar 75 and bears at its opposite ends against these elements to allow relative movement between these two sections in one direction. Secured to the free end of the pedal 57 and also to the pedestal 11 is a spring 77 arranged to normally tend to lift the free end of the pedal and hold it in its upperpost position. Connected at one end with the arm 53 and at its other end to the frame or top 10 is another spring 7S tending to rock the motor and its support on the rod 38 to the left as viewed in Fig. 1 to bring the driving pulley 33 against the pulley 39 to reverse the shaft 17. The upper section of the connecting rod 58 is connected with the arm 53 under certain conditions. As indicated in Fig. 7, the section 71 extends through a slot 79 in the arm and is provided with a notch tapered at one side 3() to a shoulder 81, and secured to the top of the arm is a plate 82 adapted to Xtend into this notch and engage the shoulder 81. Below the arm 53 the section 71 is provided with a lateral pin 83 adapted to engage the under side of the arm and with the plate 82 acting through shoulder 81, forming a rigid connection between the arm and the section 71. Should, however, the shoulder 81 be moved from engagement with the plate, it will be apparent the arm may move upwardly independently of the section 71.

l prefer to provide an automatic reversing mechanism which comprises a bar 84 pivoted to the section 71 and to an arm of a lever 85 fulcrumed to the support 14 at 36. rihis lever has a curved slot 87 in which is adjustably mounted a stop pin 83. This pin projects int-o the path of movement of some portion of the work support. 39, such as the upright front wall 9() thereof. This work support carries the. work to be tapped, a piece being shown diagrammatica-lly at. 91, and is slidably mounted in the support 14 and guided in its movement by the guiding member 92. yThis member is adjustably secured on supporting member' 14 by a clamping screw 93 projecting through a slot 94 in the supporting member 14. By this screw the guide may be adjusted toward andfroni the tool and secured in adjusted position. rlhis guide has guiding portions 95 extending through bearings in the work support with a spring 9G tending to hold this support retracted to its left hand position, as shown in F ig. 5.

The operation is as follows:

lVhen machine is not in use the weight G1 will pull down the rear end of the pedal carrier 55 about the fulcrinn 54 to the dotted line position, shown in Fig. 1, and through maal-34 the connecting rod ,63%.64 will open 4the switch 62, which-I `term. themain or primary power controlling means, and willstop the motor, this switch beingconnected vin the usual manner to a, suitable source of electric power byleads indicated at 97, and of course has suitable connection wit-hzthe motor. It will-thusbe apparent ythat as ,soonl as the operator leaves then'iachine, the power is automatically cut olf preventing waste of power and unnecessary wear on the machine. IVhen it is desired to use the machine the operator places one or both feet on the pedal 5? and presses downwardly on the forward edge of the pedal carrier moving the same about its pivot to the full line position, shown in Fig. l, and closing the switch 62. This will start the motor running, and during the normal operation of the machine the pedal carrier remains in this position. The direction of rotation of the shaft, however, is controlled by the pedal 57 through the connecting rod 58 and arm 53 by rocking the motor and its support 36 on lthe rod 38 to bring the driving pulley 33 into engagement with the pulleys 29 and 30 to rotate the shaft 17 in the direction desired. This I term the secondary or auxiliary power controlling means. As the shoulder 81 is normally in engagement with the plate 82 depression of the rear edge of the pedal will pull downwardly on the arm 53 and rock the motor to the right or clockwise, as viewed in Fig. l, bringing the driving pulley 33 into engagement with the pulley 29 and rotate the shaft in a direction for the tapping operation. Removal of pressure on the pedal will allow the springs 77 and 78 to rock the motor and its support counterclockwise, as viewed in Fig. 1, to remove the driving pulley 33 from engagement with the pulley 29 and bring it into engagement with the pulley 30, as shown in Fig. 3. This will reverse the shaft 77 and allow withdrawal of the work from the tap.

Should it be desirable to use the automatic reversing mechanism, the stop pin 83 is properly located in the slot 87 in the path of movement of the work holder. Assuming that the pedal has been depressed to bring the pulley 33 into engage-ment with the pulley 29 and the shaft is running forwardly, as the work is now advanced to the tap the work holder will be moved forwardly or towards Ithe stop pin until the tap has been advanced into the work the distance desired. The work holder then engages the stop pin, swinging the lever 85 about its pivot and through the bar 84k withdraws the shoulder 8l from engagementl with the plate 82. This disconnects the connecting rod 53 from the arm 53 and allows the spring 7 8 to rock the motor and its support counter-clockwise, as viewed in Fig.

l to bring driving pulley 33 into contact tatable sliding element, and as the pulleys are all rigidly connected with their various shafts at all times the device is very durable and not easily gotten out of order in operation, besides being simpler and easier to manufacture. It also does away with a sliding connection between the pulleys and the shaft. It will be apparent that the movement required of the motor and the driving pulley 33 in the operation of controlling the shaft is very slight and that, therefore, very slight movements of the pedal are required, so that the control is very easy on the operator and allows great speed in operation of the machine.

Having thus set forth the nature of my invention, what I claim is:

l. In a machine controlling mechanism, a frame, a shaft carried by said frame, a rod having spaced bearings in said frame and an adjustable thrust bearing at one end thereof, yielding means tending to hold the rod against said thrust bearing, a support secured to said rod, a motor mounted on said support, cooperative driving means between the motor and shaft arranged to become connected and disconnected upon movement of said motor, and means for rocking said support and motor to control operation of the shaft.

2. In a machine controlling mechanism, a frame, a shaft carried by said frame, spaced pulleys carried by said shaft, a rod extending in a direction transversely the axis of the shaft having bearings in said frame, an adjustable thrust bearing for said rod, a support secured to the rod, a motor mounted on said support, a pulley operated by said motor and movable to and from engagement with the pulleys on the shaft alternately as the motor support is rocked, and means for rocking said support to control operation of the shaft.

3. In a machine controlling mechanism, a frame, a shaft, a rod having spaced bearings in said frame, an adjustable thrust bearing for said rod, a spring tending to retain the rod against said thrust bearing, a motor mounted on said rod, cooperative driving means between the motor and shaft arranged to become connected and disconnected upon movement of said motor, and means for rocking said motor to control the operation of the shaft.

a In a machine controlling mechanism, a shaft, spaced pulleys carried by said shaft, a rod extending in a direction transversely of the axis of the shaft, bearings for said rod, an adjustable thrust bearing for said rod, a spring tending to retainsaid rod 10 against the thrust bearing, a motor mounted on the rod, apulley operated by said motor and movable to and from engagement With the pulleys on the shaft alternately as the motor is rocked, and means for rocking the 15 motor to control the operation of said shaft. In testimony whereof I aiiX my signature.

HARVEY HUBBELL. 

